If your cheap BMW INPA K+CAN USB interface with FTDI chip failed to install drivers or the system prompt cannot locate the drivers. Here is a little write-up on how to fix it.
I am using Windows 8.1 system. No sure if it works on yours. You are on your own risk.
Here are the INPA driver & software free download links. If the driver/software is working, then ignore the next part.
1. Open your Device Manager. Control Panel–Hardware & Sound–Device Manager.
2. Connect the INPA K+DCAN cable with computer/PC-Double click
3. Locate USB Serial Converter->DetailsDropdown Menu->Hardware IDs. The PID number is the one you want. Will most likely be 0000.
4. Download CDM v2.08.30
5. Disable “Driver signature verification” Settings–Change PC Settings–Recovery–Advanced Startup–Restart.
This will restart your PC to Advanced settings. From there: Troubleshoot–Advanced Options–Startup Settings–Restart–F7
6. Unzip the Drivers file that you just downloaded and open up
10. Back in your Device Manager double click on your OBDII cable again.
Locate USB Serial Convertor Properties->Driver->Update Driver-> Browse my computer.
Locate your driver and install. You will need to install it for both USB Serial Converter and Ports & COM.
11. Setup INPA cable as normal and run INPA software.
It seems that the white FTDI chip INPA cables have to be manually put into D-CAN mode. This file will take care of that. It is normal for the LED to go out.
If you put the cable into DCAN mode, the LED goes off, and it says there is no adapter connected. Please connect it to the car and run the DCAN mode.